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UNS C67300 Leaded Manganese Bronze

C67300 bronze is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the H50 (extruded and drawn) temper.

It has a moderately low melting temperature among wrought brasses. In addition, it has a moderately low thermal conductivity and a moderately high tensile strength.

The graph bars on the material properties cards below compare C67300 bronze to: wrought brasses (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

110 GPa 15 x 106 psi

Elongation at Break

12 %

Poisson's Ratio

0.31

Rockwell B Hardness

91

Shear Modulus

41 GPa 5.9 x 106 psi

Shear Strength

300 MPa 44 x 103 psi

Tensile Strength: Ultimate (UTS)

500 MPa 73 x 103 psi

Tensile Strength: Yield (Proof)

340 MPa 50 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

130 °C 260 °F

Melting Completion (Liquidus)

870 °C 1610 °F

Melting Onset (Solidus)

830 °C 1530 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

95 W/m-K 55 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

22 % IACS

Electrical Conductivity: Equal Weight (Specific)

25 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

55 MJ/m3

Resilience: Unit (Modulus of Resilience)

550 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

30 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Among wrought copper alloys, the composition of C67300 bronze is notable for including aluminum (Al) and silicon (Si). Aluminum is used to add strength and oxidation resistance. Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.

Copper (Cu) 58 to 63
Zinc (Zn) 27.2 to 39.1
Manganese (Mn) 2.0 to 3.5
Lead (Pb) 0.4 to 3.0
Silicon (Si) 0.5 to 1.5
Iron (Fe) 0 to 0.5
Tin (Sn) 0 to 0.3
Nickel (Ni) 0 to 0.25
Aluminum (Al) 0 to 0.25
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

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